<template>
  <div class="xtx-dialog"  v-show="visible"  :class="{fade}">
    <div class="wrapper" :class="{fade}">
      <div class="header">
        <h3> {{ title }} </h3>
        <a @click="closeDailog" href="JavaScript:;" class="iconfont icon-close-new"></a>
      </div>
      <div class="body">
        <!-- 默认插槽 -->
        <slot />
      </div>
      <div class="footer">
         <slot name='footer' />
      </div>
    </div>
  </div>
</template>
<script>
import { ref, onMounted, watch } from 'vue'


// vue3.0 v-model:visible 语法糖，拆解 （:visible + @update:visible）
// vue2.0 visible.sync 语法糖，拆解 （:visible + @update:visible）
export default {
  name: 'XtxDialog',
  props:{
      title:{
          type:String,
          default:''
      },
      visible:{
          type:Boolean,
          default:false
      }
  },
  setup (props, {emit}) {
    const fade = ref(false)

    // visible 变化
    watch(()=>props.visible, (newValue)=>{
      // 结构和样式同时加上无过度效果，需要些延时。
      setTimeout(() => {
        fade.value = newValue
      }, 0)
    },{immediate:true})

    // 点击关闭
    const closeDailog = ()=>{
        emit('update:visible', false)
    }

    return { fade ,closeDailog}
  }
}
</script>
<style scoped lang="less">
.xtx-dialog {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: 8887;
  background: rgba(0,0,0,0);
  &.fade {
    transition: all 0.4s;
    background: rgba(0,0,0,.5);
  }
  .wrapper {
    width: 600px;
    background: #fff;
    border-radius: 4px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-60%);
    opacity: 0;
    &.fade {
      transition: all 0.4s;
      transform: translate(-50%,-50%);
      opacity: 1;
    }
    .body {
      padding: 20px 40px;
      font-size: 16px;
      .icon-warning {
        color: @priceColor;
        margin-right: 3px;
        font-size: 16px;
      }
    }
    .footer {
      text-align: center;
      padding: 10px 0 30px 0;
    }
    .header {
      position: relative;
      height: 70px;
      line-height: 70px;
      padding: 0 20px;
      border-bottom: 1px solid #f5f5f5;
      h3 {
        font-weight: normal;
        font-size: 18px;
      }
      a {
        position: absolute;
        right: 25px;
        top: 25px;
        font-size: 24px;
        width: 20px;
        height: 20px;
        line-height: 20px;
        text-align: center;
        color: #999;
        &:hover {
          color: #666;
        }
      }
    }
  }
}
</style>